Synthetic penicillins

ABSTRACT

ARYLCHLORO (AND BROMO) CARBONYL KETENES, ARYLCARBOXY KETENE ESTERS AND ARYL CARBOTHIOLIC PHENYLESTERS DERIVED THEREFROM, METHODS FOR THEIR PREPARATION AND THE USE OF THE ESTERS AS ACYLATING AGENTS FOR THE PRODUCTION OF ESTERS OF A-CARBOXY- AND A-CARBOTHIOLIC ARYLACETYL DERIVATIVES OF 6-AMINOPENICILLANIC ACID AND, BY HYDROLYSIS, THE CORRESPONDING ACID DERIVATIVES ARE DESCLOSED.

United States Patent Oifice 3,574,189 Patented Apr. 6, 1971 3,574,189 SYNTHETIC PENICILLINS Kenneth Butler, Waterford, Conn., assignor to Pfizer Inc., New York, N.Y. No Drawing. Filed Jan. 5, 1968, Ser. No. 695,851 Int. Cl. C07d 99/16 US. Cl. 260-2391 3 Claims ABSTRACT OF THE DISCLOSURE Arylchloro (and bromo) carbonyl ketenes, arylcarboxy ketene esters and aryl carbothiolic phenylesters derived therefrom, methods for their preparation and the use of the esters as acylating agents for the production of esters of a-carboxyand a-carbothiolic arylacetyl derivatives of 6-aminopenicillanic acid and, by hydrolysis, the corresponding acid derivatives are described.

BACKGROUND OF THE INVENTION This invention relates to a series of novel derivatives of arylcarboxy ketenes, to methods for their preparation, and to their use as intermediates for further synthesis. More particularly, it relates to a series of novel arylchlorocarbonyl ketenes and to the corresponding bromo analogs; to novel arylcarboxyand arylcarbothiolic ketent esters derived therefrom, to the use of the esters as novel acylating agents for the acylation of amines such as 6-aminopenicillanic acid, and to the novel acyl amines thus produced.

The production of ketenes from malonic acid derivatives is described in the literature. Stanndinger, Helv. Chim. Acta 8, 306 (1925), for example, prepared a series of low-molecular-weight dialkyl ketenes by the thermal decomposition of di(lower) alkyl substituted malonic anhydrides. In a modification of this method using mixed anhydrides prepared from disubstituted malonic acids and diphenyl ketene, Staudinger et al., Ibid, 6, 291 (1923) and Ber. 46, 3539 (1913) prepared various disubstituted ketenes by thermal decomposition. A still further method comprises the dehalogenation of a-halo acyl halides with zinc (Staudinger, Ann. 356, 71 (1907); 380, 298 (1911)). By extension of this reaction, Staudinger et al, Ber. 42, 4908 (1909) prepared ethyl carbethoxy ketene by the dehalogenation of diethyl-a-bromo-a-ethyl malonate. Another method, the decomposition of diazo ketones, has been used to prepare certain diaryl ketenes (Smith et al., Org. Syntheses 20, 47, 1940; Gilman et al., Rec. trav. chim., 48, 464, 1929). It is further known that certain disubstituted acetyl chlorides undergo dehydrohalogenation under the influence of tertiary amines to form keto ketenes. This method, however, appears to be limited to the preparation of certain aryl and high-molecular-weight keto ketenes, all of which are relatively resistant to dimerization (Staudinger et al., Ber. 41, 594, 1908).

The reaction of phenylmalonic acid with phosphorus pentachloride (1:2 molar ratio) in ether solution is reported by Sorm et al. (Collection Czechoslov. Chem. Communs, 20, 593-6, 1955) to produce phenylmalonyl chloride. The same authors report (loc. cit.) that when the reaction is conducted in the absence of a solvent at the reflux temperature, phenylchloromalonyl chloride is produced. Both products are isolated by vacuum distillation.

The preparation of lower alkyl esters of phenylcarboxy ketene by thermal decomposition of diazoketo esters has been described by Staudinger et al. (Ber. 49, 2522, 1916). However, the method used by Staudinger is rather complex and results, on an overall basis, in rather poor yields. The process of the present invention for making such esters, on the other hand, is simple and productive of satisfactory yields.

The use of ketenes as acetylating agents is Well known in the art. The acylation of amino groups by means of simple or mixed acid anhydrides, acid halides, acid azides, j8-thiolacetones, acylated enols and carboxylic acids with carbodiimides is also known in the art (Sheehan, U. S. Pat. 3,159,617, Dec. 1, 1964). However, the introduction of a-carboxy arylacetyl groups into 6-aminopenicillanic acid has, up until now, been limited to the use of a simple or mixed anhydride, an acid halide of an arylmalonic acid or an aryl malonic acid ester as acylating agent (US. Pat. 3,142,673, British Pat. 1,004,670).

SUMMARY OF THE INVENTION It has now been unexpectedly found that a variety of aryl chlorocarbonyl ketenes, and the corresponding bromo analogs, can readily be prepared by the reaction of aryl malonic acids with a halogenating agent followed by vacuum distillation of the reaction product thus formed. The process and the compounds produced are summarized by the reaction:

wherein R broadly referred to herein as an aryl group, is selected from the group consisting of: thienyl, furyl, pyridyl, phenyl, and substituted phenyl wherein the substituent is selected from the group consisting of (lower) alkyl, chloro, bromo, (lower)alkoxy, di(lower)alkylamino and trifluoromethyl, and X is selected from the group consisting of chloro and bromo.

The process of this invention, in view of the teaching of Sorm et al. (loc. cit.) that phenylmalonyl chloride and phenylchloromalonyl chloride are obtained by the action of phosphorous pentachloride on phenylmalonic acid in the presence of a solvent and the products recovered by vacuum distillation, is most surprising and unexpected. Repetition of the Sorm et al. procedure for making phenylmalonyl chloride has been found to produce phenylchlorocarbonyl ketene rather than phenylmalonyl chloride. The existence of the ketene compound was completely unrecognized by Sorm et al.

The process, in general, comprises reacting an aryl substituted malonic acid with a halogenating agent selected from the group consisting of P(X) P(X) PO(X) and SO (X) wherein X is as defined above at a temperature of from about 0 C. to about 50 C. The dihalide thus produced is thermally decomposed at about 100 C. to provide the aryl halocarbonyl ketene.

The arylhalocarbonyl ketenes exhibit a dual functionality and react both as acid halides and ketenes. They are, therefore, valuable as intermediates for further synthesis. Alcohols (Rg-OH) and thiophenols (RqSH) for example, react with the arylhalocarbonyl ketenes at low temperatures, egg. from about -70 C. to about 30 C. to produce the corresponding esters of aryl carboxy and arylcarbothiolic ketenes which are useful as acylating agents. Reaction appears to occur first with the ketene group to form a transient intermediate (FOX (FOX R,o=o(oR2)oand R C=C(SR )O- which rearranges with elimination of hydrogen halide to the arylcarboxy and arylcarbothiolic ketene ester.

The novel arylcarboxy and arylcarbothiolic ketene esters of this invention are especially valuable as agents for the acylation of amines with production of esters of u-carbothiolic and a-carboxy-a-arylacetyl amines. They are particularly useful for the acylation of amines such as 6- aminopenicillanic acid for the production of known and novel antibacterial agents. Prior art methods for introducing OL-CaI'bOXY arylacetyl groups into amino compounds such as 6-aminopenicillanic acid have made use of acid anhydrides, mixed or simple, or acid halides of aryl malonic acids. The use of the prior acylating agents requires extreme caution during reaction and recovery steps in order to obtain satisfactory yields and avoid decarboxylation of the carboxy group. The acylating agents of this invention on the other hand react smoothly and rapidly with amines at low temperatures and produce no undesirable by-products.

The acid halides and esters of the aryl carboxy ketenes form 3-aryl substituted 2-oxo-oxetenes (1,3-epoxypropenes) in solution. These compounds react in a manner analogous to that of the compounds from which they are derived.

The above reactions are summarized in the following sequence:

R1 V) l: lRrNHi wherein R and X are as defined above; X is selected from the group consisting of CR and SR wherein R is selected from the group consisting of phenyl and substituted phenyl wherein the substituent is selected from the group consisting of at least one of chloro, bromo, fluoro, lower alkyl, alkoxy, lower alkanoyl, carbo(lower)alkoxy, nitro, and di(lower)alky1 amino;

furyl, anthracenyl, quinolyl, phenanthryl, methyl substituted quinolyl, (1,3-benzodioxolyl),

and

wherein Z is lower alkylene and is selected from the group consisting of -(CH and --(CH and substituted derivatives thereof wherein the substituent is selected from the group consisting of methyl, chloro and bromo.

benzyl and substitu ted benzyl wherein the substituent is groups having a greater number 0 4 selected from the group consisting of chloro, bromo, fluoro, lower alkyl, lower alkoxy, lower alkanoyl, carbo (lower) alkoxy, nitro, and di(lower)alkylamino;

ac-indanyl and substituted derivatives thereof wherein the substituent is selected from the group consisting of methyl, chloro and bromo; ac-tetrahydronaphthyl and substituted derivatives thereof wherein the substituent is selected from the group consisting of methyl, chloro and bromo; alkyl and substituted lower alkyl wherein the substituent is selected from the group consisting of at least one of:

chloro, carbo(lower alkoxy), bromo, lower alkanoyl, fluoro, lower alkoxy, and nitro, cyano;

CH CH -NR R --CH --CI-I CH NR R CH -CH(CH )NR R and CH(CH )CH NR R wherein NR R is selected from the group consisting of -NH(loWer alkanoyl),

/(lower alkyl) (lower alkyl) wherein the (lower alkyl) groups may be alike or different; and N(lower alkyl)anilino; and (lower alkylene)- Y wherein (lower alkylene) contains from 1 to 3 carbon atoms; and Y is selected from the group consisting of azetidino, pyrrolo,

aziridino, imidazolo,

pyrrolidino, 2-imidazolino,

piperidino, 2,5-dimethylpyrrolidino, morpholino, 1,4,5,G-tetrahydropyrimidino, thiomorpholino, 4-methylpiperidino, and

N- loweralkyl pip erazino, 2,6-dimethylpip eridino;

and R is selected from the group consisting of phenyl and mono-, di-, and tri-substituted phenyl wherein the substituent is selected from the group consisting of at least one of chloro, bromo, fluoro, lower alkyl, lower alkoxy and trifiuoromethyl, with the proviso that only one of the positions ortho to the thio group of the phenyl moiety be substituted; and R is CH-CH C(CHa):

o= H-COOH Of the lower alkyl, lower alkoxy, lower alkanoyl and carbo(lower)alkoxy groups those having from one to four carbon atoms in the alkyl, alkoxy and alkanoyl moieties are preferred since the reactants bearing such groups are more readily available than are those required for such f carbon atoms.

Also included within the scope of this invention are the pharmaceutically acceptable salts of the novel compounds of Formula III in which one or both acid groups are involved in salt formation. Salts such as the sodium, potassium, calcium, magnesium, ammonium and substituted ammonium salts, e.g., procaine, dibenZylam-ine, N,N'-dibenzylethylenediamine, N,N-bis(dehydroabietyl)ethylenediamine, l-ephenamine, N-ethylpiperidine, N-benzyl-B- phenethylamine, trialkylamines, including triethylamine, as well as salts with other amines which have been used to form salts with benzylpenicillin are useful for the preparation of pharmaceutically elegant compositions of these valuable antibiotics.

DETAILED DESCRIPTION OF THE INVENTION The production of arylchloro (and bromo) carbonyl ketenes comprises the reaction of an arylmalonic acid with a halogenating agent selected from the group consisting of P(X) P(X) PO(X) and SO(X) wherein X is as defined above at temperatures ranging from about 0 C. to about 50 C. for periods ranging from about one hour to about hours. The reaction is conducted in the presence of a solvent system, preferably a reaction-inert solvent system. Suitable solvents are dialkyl ethers, e.g. diethyl ether, dipropyl ether, monoand dimethyl ethers of ethylene glycol and propylene glycol, methylene chloride and chloroform.

The reaction period is, of course, dependent upon the reaction temperature and the nature of the reactants. However, for a given combination of reactants, the lower temperatures require longer reaction periods than do higher temperatures.

The molar proportions of reactants, i.e. arylmalonic acid and halogenating agent, can vary widely, e.g. up to 1:10 or higher, but for satisfactory yields should be at least stoichiometric. In actual practice the stoichiometric ratio of reactants is preferred.

The reactants may be added all at once or separately. If separately, the order of addition is not critical. However, it appears that the reaction is smoother and subject to fewer side-reactions, as evidenced by the color of the reaction mixture, particularly upon distillation, when the arylmalonic acid is added to the halogenating agent. The reaction mixture, under such conditions, generally progresses from a yellow to a red color. The reaction mixture on reverse addition, i.e. the addition of halogenating agent to the arylmalonic acid, progresses from yellow to black.

The arylhalocarbonyl ketene products are isolated from the reaction by distillation in vacuo. Because of their great reactivity they are generally stored under a nitrogen atmosphere at low temperatures and in the absence of light.

Reaction of the aryl halocarbonyl ketenes with alcohols and thiophenols is conducted on a 1:1 molar ratio at a temperature of from about 70 C. to about 30 C. when conversion of the arylhalocarbonyl ketene to a ketene ester is desired. A reaction-inert solvent, such as ethyl ether, methyl ether, dioxane, methylene chloride, chloroform, is desirably used to permit better mixing and control of the reaction. The use of greater than a 1:1 molar ratio of arylhalocarbonyl ketene to alcohol or thiophenol or temperatures above 30 C. produces malonic acid diesters. For example, when two moles of alcohol are used per mole of arylhalocarbonyl ketene the corresponding diester of the arylmalonic acid is produced. Half-amides of arylmalonic acid esters are obtained by reacting the arylhalocarbonyl ketenes with an alcohol followed by reaction of the resulting arylcarboxy ketene ester with a primary or secondary amine as is described herein. Isolation of the intermediate ester is not necessary. A tertiary amine may be used as acid acceptor to remove the hydrogen halide produced during formation of the ester.

The arylcarboxy and aryl carbothiol ketene esters produced as described above are excellent acylating agents particularly suited for the acylation of amines to produce u-carbothioland a-carboxyarylacetyl amines. They are especially valuable as agents for the acylation of 6-aminopenicillanic acid. Many of the penicillin ester compounds of this invention exhibit improved absorption on oral administration over that produced by the corresponding free acid or alkali metal salt forms. They, therefore, represent convenient and effective dosage forms of the wcarbothioland a-carboxy aryl penicillins.

Additionally, many of the esters described herein, although inactive or of relatively low activity against gramnegative organisms per se, are metabolized to the parent acid, i.e. a-carboxybenzylpenicillin, when injected parenterally into the animal, including the human, body. The rate of metabolic conversion of such esters to the parent acid occurs at such a rate as to provide an effective and prolonged concentration of the parent acid in the animal body. In effect, such esters act as depot sources for the parent acid. Especially useful in this respect are those compounds wherein the ester group is COOCH CH Y wherein Y is a basic group such as di(loWer alkyl) amino, pyrrolo, pyrrolidino, piperidino, phthalimido, imidazolino and diisopropylamino; and those wherein the ester group (-COOR contains a tertiary carbon atom, such as t-butyl, trityl and 2-naphthyl.

The acylation of 6-aminopenicillanic acid is conducted at a temperature of from about C. to about 50 C. and preferably at a temperature of from about 0 C. to about 30 C. The reaction period is generally from a few minutes up to about 5 hours. A reaction-inert solvent such as ethyl acetate, dioxane, tetrahydrofuran, methyl isobutyl ketone, chloroform or methylene chloride is generally used to facilitate stirring and temperature control. It has been found especially convenient to first form the arylcarboxy or arylcarbothiol ketene ester as described above and to use the reaction mixture, without isolation of the ketene ester, directly in the amine acylation reaction. In such instances an organic base, i.e. a tertiary amine such as triethylamine or other tn'alkylarnine, preferably a tri(lower alkyl)amine, is used to remove the hydrogen halide produced in formation of the ketene ester. From a practical standpoint, the 6-aminopenicillanic acid is used as its triethylamine salt. For this reason, methylene chloride is a preferred solvent since the triethylamine salt is readily soluble therein. The sodium or potassium salts of 6-aminopenicillanic acid can also be used but the preferred salt is the triethylamine salt because of its greater solubility in the solvent systems used. An excess of the amine to be acylated can, of course, be used as acid acceptor but is generally avoided, not only for economic reasons but also to prevent possible ammonolysis of the ester group. The reaction is desirably conducted under an atmosphere of nitrogen.

The N-acylation reaction can also be conducted in neutral or alkaline aqueous solution by taking advantage of the slower rate of reaction of the arylcarboxy or arylcarbothiol ketene esters with water at neutral or alkaline pH levels relative to the rate of reaction with the amino group. The reaction is conducted at temperatures ranging from just above the freezing point of the aqueous system to about 50 C. and preferably at from 0 C. to about 20 C. To permit attainment of low temperatures and to facilitate reaction, it is advantageous to. employ a mixed solvent system, i.e. water plus a water miscible reaction-inert organic solvent such as dioxane or tetrahydrofuran. The ketene ester is, of course, desirably used as a solution in the same reaction-inert solvent and is preferably added to the aqueous solution of the 6-aminopenicillanic acid.

The acylated products are isolated by conventional methods. A typical method, for example, comprises evaporating the reaction mixture to dryness under reduced pressure, dissolving the residue in citrate buffer (pH 5.5) and extracting the product therefrom with chloroform. The chloroform extracts are Washed with citrate buffer (pH 5.5), dried with anhydrous sodium sulfate and evaporated to dryness. In another method, which is ofvalue for the isolation of acylation products poorly soluble in methylene chloride, or chloroform, the above method is followed but using n-butanol as extracting solvent in place of chloroform. The product remaining after removal of the n-butanol solvent by evaporation is triturated with ether to produce an amorphous solid.

In still another method, essentially a variation of the above methods, saturated sodium bicarbonate (or potassium bicarbonate) is used in place of the citrate buffer. This method, of course, produces the sodium (or potassium) salt of the acylation product. If necessary, to obtain a solid product, the salt is triturated with ether.

In yet another method, the residue remaining after removal of the volatiles from the reaction mixture is taken up in water at pH of from about 2.3 to 2.9, usually about pH 2.7, and the free acid form of the acylation product extracted from the acid solution with chloroform, ether, n-butanol or other suitable solvent. The chloroform, ether or n-butanol extract is then washed with aqueous acid (pH 2.3-2.9) and the product recovered by lyophilization or by conversion to a solvent-insoluble salt as by neutralization with an n-butanol solution of sodium or potassium Z-ethyl-hexanoate.

The esters are converted by known methods to the corresponding acids; for example, when R is benzyl or a substituted benzyl group, its removal is accomplished by catalytic hydrogenation in a reaction-inert solvent such as water, ethanol, dioxane, at pH of from about 5 to about 9 and at about atmospheric pressure and ambient temperature. Favored catalysts are platinum, rhodium, nickel and palladium. When R is other than benzyl or substituted benzyl its removal is effected by mild acid treatment or enzymatically with an esterase such as liver homogenate.

When preparation of the free acid form of the herein described penicillins is desired, the preferred ester groups are those wherein R is trityl, t-butyl, and ,B-diisopropylaminoethyl. These groups are readily removed by mild acid treatment resulting in satisfactroy yields of the desired acid forms of the penicillins.

The valuable products of this invention are remarkably effective in treating a number of susceptible gram-positive and gram-negative infections in animals, including man. For this purpose, the pure materials or mixtures thereof with other antibiotics can be employed. They may be administered alone or in combination with a pharmaceutical carrier selected on the basis of the chosen route of administration and standard pharmaceutical practice. For example, they may be administered orally in the form of tablets containing such excipients as starch, milk sugar, certain types of clay, etc., or in capsules alone or in admixture with the same or equivalent excipients. They may also be administered orally in the form of elixirs or oral suspensions which may contain flavoring or coloring agents, or be injected parenterally, that is, for example, intramuscularly or subcutaneously. For parenteral administration they are best used in the form of a sterile aqueous solution which may be either aqueous such as water, isotonic saline, isotonic dextrose, Ringers solution, or non-aqueous such as fatty oils of vegetable origin (cotton seed, peanut oil, corn, sesame) and other non-aqueous vehicles which will not interfere with the therapeutic efiiciency of the preparation and are non-toxic in the volume or proportion used (glycerol, propylene glycol, sorbitol). Additionally, compositions suitable for extemporaneous preparation of solutions prior to administration may advantageously be made. Such compositions may include liquid diluents, for example, propylene glycol, diethyl carbonate, glycerol, sorbitol, etc.; buffering agents, as well as local anesthetics and inorganic salts to afford desirable pharmacological properties.

The oral and parenteral dosage levels for the herein described compounds are, in general, on the order of up to 200 mg./kg. and mg./kg. of body weight per day, respectively.

The antimicrobial spectra of several esters of a-carboxybenzyl penicillins against Staphylococcus aurezts and Escherichia coli 5 are presented below. The tests were run under standardized conditions in which nutrient broth containing various concentrations of the test material was seeded with the particular organism specified, and the minimum growth (MIC) at which growth of each organism failed to occur was observed and recorded. The test materials have the following formula and were tested as their sodium or potassium salts. Benzylpenicillin (K salt) when thus tested gave values of 0.156, 100 vs. S. aureus and Escherichia coli, respectively.

TABLE I.-IN VITRO SPECTRA 2 S. aureus E. coli l-naphthyl 0. 39 6. 25 0. 39 6. 25

m-Methylpheny 0. 78 6. 25 p-Methylphenyl 0. 39 6. 25 a-Ethylphenyl 0. 39 25 tr-Isopropylphenyl 0. 39 12. 5 a-FormylphenyL 1. 56 25 c-Acetylphenyl. 50 200 p-Acetylphenyl. 25 200 c-Nitropheny1 25 200 2,3-dlmethylphenyl. 0. 78 50 3,4-dimethylphenyL 0. 78 25 2,3-dlmethoxyphenyl 1. 56 50 2-chloro-5-methylphenyl 3. 12 3. 12 4-ehloro-3-methylphenyl 1. 56 1. 56 2-chloro-3,5-dimethylphenyl 1. 56 1. 56 2-chloro-3,4-dimethylphenyl 1. 56 3. 12 2-chloro-4,5-dlmethylphenyl 0. 39 0. 39 l-chloro-2,3-dimethylphenyl 0. 19 0. 19 4-chloro-2,5-dlmethylphenyl 0. l9 0. 39 4-0hloro-2,6-dlmethylphenyl 0. 19 O. 19 2, 4-dichloro-fi-methylphenyl 0. 39 0. 39 2,4-dlchloro-3,5-dlmethylphenyL 1. 56 3. 12 4,5-dlchloro-2,3-dimethylphenyl 0. 04 0. 09 4-chloro-2-nltrophenyl 25 200 1-(1,2,3,#tetrahydrcnaphthyl)- 0. 39 12. 5 2-(1,4naphthoquinonyl) 12. 5 200 44nd 1 O. 39 6. 25 fi-indanyl--- 0. 39 6. 25 fi-quinonyl 1. 56 50 fi-quinonyl 1. 56 50 'iz tt rt "1 56 3 -1ne y pyrony 78 5 Math 0. 625 50 Eth 1. 25 100 n-Propy 6. 25 200 Isopropyl 6. 25 200 n-B utyl- 50 200 Sec-butyl 3. 12 200 t-B ut 1. 56 100 2-methylpropyl 3. 12 100 Hexy1 200 200 200 2-acet0xyethyl 3. 12 200 l-(l-carbethoxy) ethyl 100 200 2- (1,2,3-tricarbethoxy) propyl 1. 56 200 2-chloroethy1 5O 200 2,2,2-trlhc1oroethyl 100 200 2,2,2-trifluoroethyl 1. 56 25 2-(2-trifluoromethyl) propyl. 0. 78 200 l-ethew-2,2,2-trifluoroethyL 0. 78 50 1-ethoxy-2,2,2trlchloroethyl 0. 78 12. 5 l-isopropoxy-2,2,-trichloroethyl 1. 56 100 1-butoxy-2,2,2-trichl roethyl 0. 39 50 Carbethoxy ethoxy methyl 25 100 Dicarbethoxy ethoxy methyL 1. 56 50 1-(2,3-dibutyryloxy) propyl 500 200 3-oxo butyl 50 20 1,1-d1methyl acetonyl 200 200 2-nltrobutyl 100 200 l. 56 50 0. 7s 12. 5 3-d1mathylaminopropyl- 0. 78 25 3-di-(n-propy1)a1nlno-2-prop 0. 39 3. 12 2-pyrrol1dlnoethyl 0. 78 6. 25 2-(2-im dazolino) ethyl 1. 56 50 2-plper1dinoethyl 0. 78 3. 12 2-1n0rphollnoethyl 1. 56 6. 25 2-(2,5din1ethylpyrrolidino) ethyl 1. 56 12. 5 2-(4methylpiperidlno) ethyl 0. 19 6. 25 3-(pyrrplidino)propyl 0. 19 12. 5 S-piperidlnopropyl 1. 56 12. 5 3-morphpllnopropyl 1. 56 6. 25 3-pyrrol1dlno-2-propyl 0. 39 3. 12

TABLE I-Continued R2 S. aureus E. colt -piperidino-2-propyl 0. 39 1. 56 -azlrldlnoethyl 50 -pyrrolidino-1-propyl 0. 78 6. 25 2-azetidlnoethy1 3. 12 100 2-piperidlno-1-propyl 0. 78 6. 25 2-(2,6-dlmethyl plperldino) ethyl 1. 56 12. 5 2morpholino-1-propyl 3. 12 50 2-di(n-propylamino)-1-propyl 1. 56 6. 25 2-(N-methylanillno) ethyL O. 39 100 3-dl(n-propylamino)propy 0. 19 3-dimethylamino-2-p1opyl 1. 56 3-morpholino-2-propyl 1. 56

Table II presents in vivo data for several compounds of this invention in mice (PO=oral and SQ=subcutaneous routes of administration). The values are obtained under standardized condition. The procedure comprises production of an acute experimental E. coli 266 infection in mice by the interaperitoneal incubation of the mice with a standardized (l E. coli 266 culture suspended in 5% hog gastric mucin. The test compounds, in the form of their sodium or potassium salts, are administered to the lnfected mice by a multiple dosmg regimen 1n WhlCll the first dose 1s given 0.5 hour after moculatron and is repeated 4, 24 and 48 hours later. The percent of mice survivmg are then determined.

The LD of E. col: 266 (the lowest concentration requlred to produce 100% mortality In mice) 1s Control animals recelve mocula of 10- 10- and 10" as a check on possible variation in virulence WhlCh can occur.

TABLE II [In vivo data vs. E. Call 266 in mice] Percent survivors P0 e/ Q g-I e) carbethoxyethoxyrnethyl 0 2O 0 10 Dlcarbethoxyethoxymethyl. 30 0 60 40 1-ethoxy-2,2,2-trlchloroethyl 90 60 70 70 l-lsopropoxy-2,2,2-triohloroethy 20 40 30 1-butoxy-2 2,2-trlohloroethy1 10 20 0 10 l-naphthyl so 20 30 o 2-naphthyl 40 0 50 10 5-ln 0 100 60 70 60 5-lndanyl (TEA salt)- 100 70 100 100 4-indan 80 50 80 40 5-qulno1yl. 1O 0 50 30 G-quinolyl 20 20 10 20 5-(1,3-benzodioxoly1). 30 20 30 60 m-Methy1phenyl 70 30 8O 70 p-MethylphenyL- 30 20 20 20 u-Methylphenyl. 30 0 0 10 a-Ethylphenyl 2O 10 10 0 v-IsopropylphenyL. 90 60 50 50 2,3-dlmethylphenyl. 80 10 80 60 3,4-dimethylphenyl. 80 30 50 20 4-methoxyphenyl 20 10 40 30 2 (i-dimethoxypheny 10 0 0 20 m-Fluorophenyl 70 20 50 20 2-chloro-6-methylphenyL 30 10 40 30 4-ehloro-2-methylphenyL 4O 0 20 30 2-ch1oro-5-methylphenyl- 0 0 30 10 4-chloro-3-methylphenyl. 70 10 60 30 2-ehloro-3,4dimethylphenyl 20 20 30 0 4-chloro-3-rnethy1pheny1 70 10 60 30 2-chlgro-3A-dlrnethy1phenyl. 20 20 30 0 4-ehloro-3,5-dimethylphenyl. 60 10 60 30 4-ehloro-2,3-dimethylphenyl 90 0 90 60 4-chloro-2,6-dimethylpheny1 10 10 3O 10 2chloro-4,fi dimethylphenyl 20 20 70 10 4-ehloro-2,fi-dimethylphenyl 0 O 10 0 2,edichloro-fi-methylphenyl 10 10 10 2O 2,4-dleh1oro-3,5-d1m 50 10 70 50 4-eh1oro-2,3,6-trimethylphenyl- 60 60 80 40 4-chloro-2,6-dinitrophenyl 10 O 20 0 2-(5,6,7 ,B-tetrahydronaphthyl) 60 40 60 50 Phenyl 0 0 10 0 Z-dimethylamlnoethyL 0 0 1 10 2 10 2-diethylaminoethyl. 0 0 10 10 2-d1(n-propyl)amlnoethyl 20 10 90 80 2-di(isopropyDamlnoethyL 0 0 40 0 2-d1(n-butyl)aminoethyl 0 10 90 80 3-drmethylam1nopropyl 0 0 30 10 3-d1(n-propyl)am1no-2-propyL 20 0 70 30 2-pyrrolidinoethy1 10 10 80 60 See footnotes at end of table.

TABLE IIContinued Percent survivors P0 e/ Q -I e) 2-(2-imidazolino)ethyl 0 0 40 3 10 2-piperidinoethyl. 10 10 60 Z-morpholinoethyl 0 0 30 0 2-(2,5-dimethylpyrrolidono)ethyl. 0 0 60 50 l 30 0 60 50 O 0 80 20 0 0 100 80 0 0 80 70 0 0 70 50 0 0 40 2-pyrrolldino-l-prop 10 0 8O 70 2azetidir1oethyl 10 0 0 0 2piperidino- 80 70 2-(2,6dimethyl piperld 10 0 80 2-morpholino-l-propyL 10 30 40 20 2-di (n-propylamino)-1-pr 0 10 90 60 2-(N-methylanilino) ethyl- 40 0 80 10 3-di (n-propylamlno) propyl- 0 0 80 90 3-dimethylamino-2-propyl. 0 0 20 20 3-morpholino-2-propyl. 0 10 70 20 2-formamldoethyl 20 0 20 10 H 0 70 l mg./kg. 2 75 mg./kg. 3 50 mgJkg.

EXAMPLE I Phenylchlorocarbonyl ketene (A) To phenylmalonic acid (20 g.) in ethyl ether (100 ml.) there is added phosphorous pentachlor de (46 g.). A vigorous reaction occurs. The reaction mixture is refluxed for four hours then the ether partially removed by heating on a steam bath. The reaction mixture becomes black when about half the ether is removed and the remaining ether is removed under reduced pressure (at 100 mm.). The residue is distilled under vacuum and the fraction boiling at 7590 C. at 1.5-4 mm. collected. The product, a yellow liquid, is redistilled at 74 C. and 1.5 mm. It shows a strong peak in the infrared region of the spectrum at 4.69

Repetition of this procedure but using 10 g. of phenylmalonic acid instead of 20 g. produces a less vigorous reaction on addition of the phosphorous pentachloride. The same product is obtained.

(B) Phosphorous pentachloride (23 g.) is added over a 5-minute period to a stirred solution of phenylmalonic acid (10 g.) in ethyl ether (50 ml.) initially at a temperature of 0-5 C. The temperature rises to 13 C. during the addition. The mixture is then refluxed for five hours and allowed to stand overnight at room temperature. Removal of the ether at 20 mm. produces a dark concentrate which is vacuum distilled to give the desired product: B.P. 80-88 C. at 1.5-2.0 mm. and 74 C. at 0.2

(C) To a stirred solution of phosphorous pentachloride (46 g.) in ethyl ether (100 ml.) there is added phenylmalonic acid (10 g.) over a two-minute period. The mixture is stirred at room temperature for four hours then refluxed for four hours and allowed to stand overnight at room temperature. The excess phosphorous pentachloride is filtered oif and the ether boiled off at atmospheric pressure. The reaction mixture gradually progresses in color from dark yellow to red. The residue is distilled in vacuo to give the product: B.P. 83-86 C. at 1.5 mm. as a yellow liquid.

(D) Repetition of this procedure but using an equivalent amount of phosphorous oxychloride as halogenating agent in place of phosphorous pentachloride produces the same product.

EXAMPLE II The procedure of Example LC is repeated but using the appropriate malonic acid derivative in place of phenylmalonic acid to produce the following compounds.

p-chlorophenyl m-chlorophenyl o-butoxyphenyl o-dimethylaminophenyl o-diethylaminophenyl m-dimethylaminophenyl p-dimethylaminophenyl o-methoxyphenyl m-methoxyphenyl p-methoxyphenyl o-trifluoromethylphenyl p-trifluoromethylphenyl m-trifluoromethylphenyl o-isopropylphenyl 3-furyl EXAMPLE III Repetition of the procedures of Examples I-C and II but using PBr in place of PCI produces the corresponding bromo compounds.

EXAMPLE IV Methyl ester of phenylcarboxy ketene To a solution of phenylchlorocarbonyl ketene (0.5 g.) in dry chloroform (5 ml.) there is added anhydrous methanol (0.1 ml.) at room temperature. Hydrogen chloride is liberated. The mixture, maintained under an atmosphere of nitrogen, is stirred for minutes and the product recovered by evaporation of the solvent.

EXAMPLE V Dibenzyl phenyl malonate Benzyl alcohol (0.6 ml.) is added to a solution of phenylchlorocarbonyl ketene (1.0 g.) in dry, ethanol-free, chloroform (12 ml.) at room temperature. Hydrogen chloride is evolved almost immediately upon addition of the benzyl alcohol. The mixture is stirred for five minutes, additional benzyl alcohol (0.6 ml.) added, and stirring continued for three hours. The chloroform solvent is evaporated ofi. The residue, upon standing, crystallizes. After two recrystallizations from hexane it melts at 6970 C.

Analysis.--Calcd. for C H O (percent): C, 76.65; H, 5.59. Found (percent): C, 76.92; H, 5.49.

EXAMPLE VI Benzyl phenyl-N-benzylmalonamate Benzyl alcohol (0.6 ml. in 2 ml. of methylene chloride) is added to a solution of phenylchlorocarbonyl ketene (1.0 g.) in methylene chloride (12 ml.) at 70 C. in a closed system filled with nitrogen gas. The mixture is stirred for three minutes then benzylamine (1.2 ml. in 2 ml. of methylene chloride) added. An immediate precipitate forms. The mixture is held at 70 C. for one hour with occasional shaking and then warmed to room temperature. The mixture is held at 70 C. for one hour with occasional shaking and then warmed to room temperature. The mixture is filtered and the filtrate evaporated to dryness. The residue, a somewhat gummy solid, is slurried in ether, filtered and then recrystallized twice from hexane, M.P. l43l43.5 C.

AnaZysis.-Calcd. for C H NO (percent): C, 76.85; 11:11, 5.88; N, 3.89. Found (percent): C, 76.67; H, 5.86;

Repetition of this example but using the compounds of Examples II and III in place of phenylchlorocarbonyl ketene produces the corresponding malonamates.

EXAMPLE v11 A mixture of phenylmalonic acid (5 g.) and thionyl chloride (30 m1.) is heated to reflux for six hours to give a clear yellow solution. Removal of the excess thionyl chloride by evaporation provides the crude phenylchlorocarbonyl ketene. The pure compound is obtained by distillation in vacuo.

EXAMPLE VIII Esters of arylcarboxy ketenes-General preparation method To a solution of the appropriate aryl halocarbonyl ketene (0.1 mole) in methylene chloride (suflicient to provide a clear solution and generally from about 5 to 10 ml. per gram of ketene) there is added the proper alcohol R OH (0.1 mole). The reaction mixture is maintained under an atmosphere of nitrogen and stirred for a period of from 20 minutes to 3 hours, care being taken to exclude moisture. The temperature may range from about -70 C. to about -20 C.

The compounds thus prepared are presented below.

2 l-methyl-Z-nitroethyl 4-nitrobuty1 l-methyl-Z-nitropropyl 2,2-dinitroethyl 1-methyl-2-chloro-2-nitroethyl 1-trichloromethyl-2-nitroethyl 1,1-dimethyl-2,2,2-trichlorethyl Z-methoxyethyl 2-ethoxyethyl 2-isobutoxyethyl 4-ethoxy-n-butyl 1, l-dimethyl-Z-ethoxyethyl l-cyanoethyl 4-cyanobutyl 2-cyanol-methylethyl 1-chloromethyl-Z-cyanoethyl 1-cyano-2,2-dichloropropyl 1-cyano-2,2,2-trichloroethyl l-methyl- 1- 1'-cyano-1'-methylethoxy) ethyl 2-acetoxyethyl Z-butyryloxyethyl 2-acetoxy-n-butyl carbomethoxymethyl Z-carbethoxyethyl 4-carbethoxybutyl Z-carbethoxypropyl l-carbethoxyethyl 1-chloromethyl-2-carbethoxyethyl 1-trichloromethyl-2-carbomethoxyethyl 1-carbethoxy-2,2-dichloropropyl 1-carbomethoxy-Z,2,2-trichloroethyl 1-carbomethoxymethyl-2,2,2-trichloroethyl acetonyl acetonylmethyl 4-oxopentyl 1-methyl-4-oxopentyl 1-methyl-3-oxobutyl l-acetyl-l-methylpropyl 2-acetylbutyl 2-acetylpropyl 5-oxohexyl 1methoxy-2,2,2-trichlorethyl 1-methoxy-2,2,2-trifluoroethyl methyl ethyl n-propyl n-butyl sec-butyl t-butyl u-isopropylphenyl 2,5-diethylpheny1 3-methyl-5-ethylphenyl p-chlorophenyl a bromophenyl p-fluorophenyl p-trifluoromethylphenyl 2,4,5 -trichlorophenyl p-methoxyphenyl m-ethoxyphenyl 2-methoxy-4-methylphenyl 4-methoxy-2,S-dimethylphenyl 4-chloro-2-methylphenyl 4-bron1o-3 -methylphenyl 5-chloro-2,4-dimethylphenyl 4,6-dichloro-3-methylphenyl EXAMPLE XI General methods for acylation of 6-aminopenici1lanic acid To a solution of the appropriate aryl halocarbonyl ketene (0.1 mole) in methylene chloride (sufiicient to provide a clear solution and generally from about 5 to 10 ml. per gram of ketene) there is added the proper alcohol R OH (0.1 mole). The reaction mixture is maintained under an atmosphere of nitrogen and stirred for a period of from 20 minutes to 3 hours, care being taken to exclude moisture. The temperature may range from about 70 C. to about 20 C. The infrared spectrum of the mixture is then taken to determine and confirm the presence of the ketene ester. A solution of 6-aminopenicillanic acid-triethylamine salt (0.1 mole) in methylene-chloride (50 ml.) is added and the mixture stirred at -70 to 20 C. for ten minutes. The cooling bath is then removed and the reaction mixture stirred continuously and allowed to warm to room temperature. The product is isolated by one of the methods below.

Method AThe reaction mixture is evaporated to dryness under reduced pressure and the residue taken up in citrate buffer (pH 5.5). The product is extracted from the buffer solution with chloroform. The chloroform extract is washed with citrate buffer (pH 5.5) then dried with anhydrous sodium sulfate and evaporated to dryness to give the sodium salt.

Method B-The procedure of Method A is followed but using n-butanolas extracting solvent in place of chloroform. The product obtained after evaporation of the n-butanol solvent is triturated with ether to give an amorphous solid.

Method C--This procedure, a variation of Method A, uses a saturated aqueous solution of sodium (or potassium) bicarbonate in place of citrate buffer to produce the sodium (or potassium) salt of the penicillin product. It is generally used for the recovery of those penicillin products which are poorly soluble in methylene chloride or chloroform.

Method DThe reaction mixture is extracted twice with saturated aqueous sodium or potassium bicarbonate, washed with Water, dried and evaporated to dryness to give the sodium (or potassium) salt. The product, if not a solid, is triturated with ether.

Method E-This method, a modification of Method D, is used for those penicillins which are diflicultly soluble in methylene chloride. The sodium (or potassium) bicarbonate solution (Method D) is extracted with n-butanol, the butanol extract dried and evaporated to dryness.

Method F-This method is used to isolate the free acid form of the penicillins.

The residue remaining after evaporation of the reaction mixture to dryness is taken up in aqueous acid, e.g., HCl, at pH 2.7 and the product extracted therefrom by means of n-butauol. The butanol extract is washed with aqueous acid (pH 2.7) and then lyophilized.

Method F1The butanol extract of Method F is neutralized with an n-butanol solution of potassium 2-ethy1 hexanoate to precipitate the potassium salt of the penicillin.

The following compounds are thus prepared.

R2 Method M Methyl A Na A Na A N a A Na A Na A Na A Na t-Butyl A Na 2-ethyl-l-butyl K Hex Na OctyL. K

Decyl K Dodecy Na Tetradeey Na Octadecyl K 2 chloroethyl Na. 2-eh10ropropy Na 3-chloropropyl; Na 1-methyl-2-chloroethyl Na 2-ehlor0-1-butyL. Na 3-chloro-1-butyl. N a 4-chlo1'0-1-butyl Na l-ethyl-Z-chloroethyl. N a l-methyl-B-chloropropy Na l-methyl-Z-chloropropyl. Na 2,2-dimethyl2-chloroethy1 Na 1 ,1-dimethyl-2-ehloroethyl Na 2bromoethyl K 1,l-dimethyLZ-bromoethyl- K 1,3-diehloropropyl vNa 2,3-dibromopropy1 Na 1,l-diohlorornethylethyL Na 2hromo-3-ehloropropyl. Na 2-chloro-3-bromopropyl. Na 1,4dibrom0-2-butyl Na. 3,4-dichloro-1-butyl. Na

2,2,3-triehlorobutyl. 2-chloro-2,3-dibromobu 2,2,3,3-tetrabromopropyl 2,2,2-triehloroethyl 2,2,2-trifluoroethyl 2-(2 trifluoromethy 3,3,3-tnfi uompropyl. Z-nitroethyl Z-nitropropyl c 3-nitropropyl l-methyl-2-nitroethyl 2-nitrobutyl 3-nitrob utyl l-methyl-Z-nitropro 2-methyl-2-nitropro 2,2-dinitroethyl l-methyl-2,2-dinitroethyl I-ethyLZZ-dlnitroethyl. 2-bromo-2-nitroethyl 2chloro-2-nitropropyl. 2-bromo-2-nitropropy1 Lmethyl-2-chloro-2-nitr0ethyl 3-methy1-3-nitropropyl l-mothyl-2-bromo-2-nitroethyl o0wwwwwwwwww t t t r t wtowwwwwa1 ewweewe I,1-dimethyl F-l- 1,1-dimeth F-l l-cyanoethyl. t E Z-cyauoethyl. E

Substitution of R OH by *R SH in this procedure pro- 2-chloro-2-nitropropyl 9 l-methy1-2-bromo-2-nitroethyl 2-chI0ro-2-nitrobuty1 1-triehloromethyl-Z-nitroethyl l-trifiuoromethylethyl R Method M R: Method M tr-Nitorbenzyl C K 1,3-dieh1oropropy1 A Na m-Nitrobenzyl C K 2,3-dibromopropyl A Na a-Methoxybenzyl C K 2-bromo-3-ch1oropropyl- A Na p-E thyoxybenzyl C K 3,4-dichloro-1-buty1 A Na p-Butyrylbenzyl B K 2,2-diehlro ethyl A Na. a-Carbomethoxybenzyl B Na 2,3,3-trihromopropy1 A Na v-Fluorobenzyl A Na. 2,2,3-tnchlorobuty1 A Na u-Dimethylaminobenzyl F-l K 2, 2,3,3-tetrabromopropyl A Na Bepzohydryl B Na 2,2,2-trioh1oroethyl A Na Tntyl B Na 2,2, 2-trifluoro ethyl A Na Cholesteryl B Na 3,3,3-trifiuoropropyl A Na 2-fnry1methyl- D Na 1 0 2-nittoethy1 B 3-pyndylmethyl F H 3-nitropropy1 B [2,2-diethy1-1,3-di0xo1on-4-y11-methyL B Na 3-nitrobut B (Z-pyrrolidono) methyl B Na 1-methy1-2-nitropropyl B (4-imidazolyl) methyl F-l K 2,2dinitroethyl 0 l-indanyhnethyl B Na 1-methy1-2,2-dinitroethyl C phthahnudomet'nyl F1 K 2-bromo-2-nitroethyl B (4-N-methy1)pyridy1 F-1 K g duces the following penicillins:

R1-CHC ONHR4 C O S R1 R Method M Phenyl A Na a-Tolyl A Na p-Tolyl A Na m-Tolyl B K p-Tolyl B K p-isopropylphenyl B K p-t-Butylphenyl B K 2,5-dimethy1phenyl. B K 2,5-diethy1pheny1 B K 2-methy1-5-isopropy1phenyl. B K 4 t-butyl-Z-isopropylphenyl B K a-Chlorophenyl B Na. p-ChlorophenyL- B Na m-BromophenyL. B Na p-FluorophenyL B Na 2,4-diehloropheny1 A Na 3 4-d1eh1oropheny1 A Na 2,3,5-trichlorophenyL- A New 2,4-dibromopheny1- A Na 2,4,5-tribromopheny1..- A Na 4-chloro-2-methy1phenyl. B Na 6-oh1oro-3-methy1phenyl- B Na 3-ch1oro-4-methy1pheny1. B Na 6-ch1oro-3-isopropylphenyl- B Na 2-bromo-4-isopropylpheny1. B Na 2-chloro-3,5-dimethy1pheny1 B Na -chloro-2,4-dimethylphenyl B Na 4,6-dichloro-B-methylphenyl A Na 2,4-difiuorophenyl A Na m-Trifiuoromethylphenyl A Na, p-Trlfiuoromethylphenyl A Na m-Methoxyphenyl O Na p-Methoxyphenyl. O Na a-Ethoxyphenyl O Na p-Bntoxyphenyl O Na 2-methoxy-4methylphenyl 0 Na B-methoxy-Z-methylphenyl O Na 3-methoxy-4-methy1pheny1 O Na 5-methoxy-3-methylphenyl C Na 3-t-butyl-4-methoxyphenyl B K 4-methoxy-2,5-dimethy1pheny1 B K 2,5-di1nethoxypheny1 F H 3,4-di-1sopr0poxyphenyl F H 4-methoxy-2,5-dipropy1pheny1 F-l K 2-ohloro-4-methoxypheny1 A Na 4-bromo-3-methoxyphenyl A Na 5-bromo-2-methoxypheny1 A Na, 4-butoxy-2-chloropheny1 E Na 2,5-dieh1oro4-ethoxyphenyl .e B K 3-ethyl-4-methoxypheny1 B K EXAMPLE XIII Other arylhalocarbonyl ketenes of Examples II and 111 wherein R is 3-furyl, 3-pyridy1, 4-pyridyl, p-tolyl, a-methoxyphenyl, p-methoxyphenyl, p-trifluoromethylphenyl, p-chlorophenyl, a-dimethylam-in'ophenyl and p-dimethyL aminophenyl, are converted to penicillins by the methods of Example XI. For convenience only the R values are listed.

2 Method M 1 ,1-din1ethy1-2,2,2-trifiuoroethyl 2-methoxyethyl 2-n-butoxyethy1 3-methoxypropy1 3-see-butoxypropyl 4-ethoxy-n-butyl 1 ,1-dimethyl-2-methoxyethyL- 2-eyano ethyl 3-cyanopropyl 1-cyano-2-eh1oropropy1 l-eyano-2,2-dich1oropropy1 1-eyano-2,2,2-trichlor0ethyl 1-oyano-2,2,Z-tribromoeth l-methyl-l-(1-cyano-1-methylethoxy) propyl. 2-acetoxyethyl 2-aeetoxypropyl 3-butryry1oxypropyl 4-propi0ny10xy-n-butyL Carbobutoxymethyl. 2-carbethoxyethy1 3-carbobutoxypropyl. 4-carbethoxybutyl.

l-carb omethoxy-2,2,2-trioh1oroet 1-carbethoxy-2,2-dichloroethy1. l-carb omethowmethyl-2,2,2-tric Acetonyl 2-oxopenty1 2-methy1-3- l-acetonylbutyl l-ethy1-2-methy1-3-0X0buty 4-oxohexy1 1-methoxy-2,2,2-trifiuoroethyL 1-butoxy-2,2,2-trifluoroethyl. 2,3-diacetoxypropy1 2, 3-dicapry1oxypropy1. 2,3-dlstearoy1oxypropyl (1,2,3-tricarb omethoxy) -2-propy (1,2,3-tricarbobutoxy)-2-propy1. 2-chloro-3,3-dimethoxypropy1. l-methy1-2,2-diethoxyethyl p 1-triohloromethyl-3-oxobuty 2-fiuoroethy1 1-nitro-1-trlfiuoromethyl-2,2, 4,4,4-trifiuorobutyl Dicarbethoxyethoxymethyl 1,1-dlcarbethoxymethyl- -ethoxyethy Garb ethoxyethoxymethyl Chlorodicarbomethoxymethyl- Bromodicarb omethoxymethyl. l-isoprop oxy-2,2,2-trich1oroethy1 1-t -butoxy-2,2,2-trich1oroethyl 1121110arbfmethoxyethoxymethyl wtwwwww wwwwwwwww i wwwwwwmemwwmwwwoowwwwwwwwwwwwmw III m-Ethoxyphenyl. p-n-Butoxyphenyl. a-Ch1orophenyl p-Chlorophenyl m-Bromophenyl p-FluorophenyL. a-Formylphenyl.

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